The shunt active power filter (SAPF) is an effective means for the modification of power \nquality. However, the compensation performance of SAPF would be deteriorated when the \nunbalanced nonlinear loads are present in the power system. To enhance the compensation \nperformance of SAPF, the adaptive frequency-based reference compensation current control \nstrategy is proposed in this paper. The proposed solution procedure can be divided into three \nstages including adaptive frequency detection, phase synchronization, and adaptive compensation. \nWith the tracking of power system frequency, the phase synchronization for the SAPF \ncompensation can be effectively modified under the power variation of unbalanced nonlinear \nloads. Based on the correct synchronization phase angle, the reference compensation current of \nSAPF can be accurately obtained with the adaptive linear neural network (ALNN) in the stage of \nadaptive compensation. In addition, the direct current (DC)-link voltage of SAPF can also be \neffectively regulated to maintain the compensation performance. To verify the effectiveness of the \nproposed adaptive frequency-based reference compensation current control strategy, the \ncomprehensive case studies implemented with the hardware-in-the-loop (HIL) mechanism are \nperformed to examine the compliance with the specification limits of IEEE Standard 519-2014. The \nexperimental results reveal that the performance of proposed SAPF control strategy is superior to \nthat of the traditional instantaneous reactive power compensation control technique (p-q method) \nand sliding discrete Fourier transform (DFT).
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